KR20230067980A - Composition for polyurethane foam, molded article thereof and manufacturing thereof - Google Patents

Abstract

The present invention relates to a composition for polyurethane foam, and more specifically, to a composition for polyurethane foam in which isocyanate and polyether polyol, which are raw materials of flexible polyurethane foam, are mixed at specific contents to adjust the chemical properties, so as to expand the range of foamable indexes is expanded by improving reactivity and curability that easily occur at low or high indexes, and to achieve stable hardness and physical properties at the corresponding indexes, a molded article, and a manufacturing method thereof.

Description

Composition for polyurethane foam, molded article and manufacturing method thereof

The present invention relates to a composition for polyurethane foam, and more particularly, by mixing isocyanate and polyether polyol, which are raw materials of flexible polyurethane foam, in a specific content to adjust chemical properties, reactivity that tends to occur at low or high indexes, It relates to a composition for polyurethane foam, a molded article, and a method for manufacturing the same, which expand the range of foamable indexes through improvement of curability and improve stable hardness and realization of physical properties in the corresponding index.

Seats play a role in providing satisfactory comfort performance to passengers in automobiles, and seat foam pads play a major role in realizing comfort performance. In the automobile industry, it is required to produce pads with various hardnesses to provide optimal comfort performance for various vehicle types and parts that are in contact with passengers' bodies. In order to respond to these requirements, an average of 20 or more types of formulations are used by one pad component producer to produce 4 to 6 types of seat pads across the industry, and the types of raw materials are 1 to 3 types of polyether polyol and 1 to 3 isocyanates are used individually or in combination.

Due to the above-mentioned production form throughout the industry, if a pad is produced at a level that exceeds the hardness implementation range of the raw material itself, physical properties (comfort, durability) are deteriorated or formability is insufficient, resulting in two cases where proper products are not produced. A number of problems may arise. If the moldability is insufficient, the manufacturer treats it as a defective product, resulting in a loss in yield and productivity. Therefore, by accepting some deterioration of physical properties and prioritizing the satisfaction of moldability, the polyurethane raw material over-injects raw materials outside the range of available indexes inherent in polyurethane. It is excessively produced, the dispersion of production quality increases, and it is the main cause of deterioration in seat comfort and durability.

The present invention is to solve the above problems, by mixing isocyanate and polyether polyol, which are the main raw materials of flexible polyurethane foam, in a specific content to adjust the chemical properties, the hardness range is 300% or more compared to commonly used raw materials. The first goal is to make improved polyurethane raw materials and formulations, and at the same time to realize the corresponding hardness, to secure moldability and physical properties in mass production molds.

In order to expand the range of index and hardness of flexible polyurethane foam, a high hardness increase rate should be expressed basically according to the index change. In addition, since the collapse of the foam must be minimized even at a high index, the stability of the foam must be maintained by increasing the cross-linking reaction, as well as minimizing the distribution of closed cells to prevent foam deformation due to shrinkage at a low index, and additionally securing the moldability of the seat pad. For this, the control of the reaction rate can be said to be the key. Insufficient foam reactivity and hardenability at a low index may cause shrinkage, and at a high index, fingerprints or tearing during demolding are likely to occur due to insufficient hardenability. By adjusting the chemical properties of polyether polyol and isocyanate, which are raw materials of flexible polyurethane foam, it is possible to expand the range of foamable indexes by improving reactivity and curability that tend to occur at low or high indexes, and to realize stable hardness and physical properties in the relevant index. can

The object of the present invention is not limited to the object mentioned above. The objects of the present invention will become more apparent from the following description, and will be realized by means and combinations thereof set forth in the claims.

A composition for polyurethane foam according to the present invention includes a first component including an isocyanate and a first polyether polyol having a hydroxyl value of 400 mgKOH/g to 600 mgKOH/g; and a second component including a second polyether polyol.

The isocyanate is 4,4- Methylene Diphenyl Diisocyanate (4,4-MDI), 2,4- Methylene Diphenyl Diisocyanate (2,4- Methylene Diphenyl Diisocyanate; 2,4- MDI), poly methylene diphenyl diisocyanate (P-MDI), modified isocyanate, and combinations thereof.

The isocyanate is 4,4-methylene diphenyl diisocyanate (4,4-Methylene Diphenyl Diisocyanate; 4,4-MDI) is 50% by weight to 70% by weight; 2,4-Methylene Diphenyl Diisocyanate (2,4-MDI) is 0.01% to 10% by weight; Poly Methylene Diphenyl Diisocyanate (P-MDI) is 5% to 25% by weight; and 0.01 wt % to 5 wt % of modified isocyanate.

The 4,4-methylenediphenyl diisocyanate (4,4-MDI) has a weight average molecular weight of 220 g/mol to 280 g/mol, and the polymethylenediphenyl diisocyanate (P-MDI) has a weight average molecular weight 350 g/mol to 450 g/mol.

The isocyanate may have an NCO content of 30 wt % to 32 wt %.

The first component may include 0.01% to 5% by weight of the first polyether polyol.

The second polyether polyol included in the second component has an average number of hydroxyl groups of 3, a hydroxyl value of 10 mgKOH / g to 40 mgKOH / g, and an ethylene oxide (EO) content of 0.01% to 20% by weight polyether polyol a; polyether polyol b having a solid content of 30% to 60% and a hydroxyl value of 10 mgKOH/g to 50 mgKOH/; and a polyether polyol c having an average number of hydroxyl groups of 2 to 6, a hydroxyl value of 10 mgKOH/g to 60 mgKOH/g, and an ethylene oxide (EO) content of 50% by weight or more; The second polyether polyol includes 60 parts by weight to 100 parts by weight of the polyether polyol a, 0.01 part by weight to 40 parts by weight of the polyether polyol b, and the polyether polyol b based on 100 parts by weight of the first component. Ether polyol c may include 0.01 part by weight to 1 part by weight.

The second component further includes at least one selected from the group consisting of a crosslinking agent, a blowing agent, a catalyst, and a foaming agent, and based on 100 parts by weight of the first component, the crosslinking agent is 1 to 3 parts by weight, the blowing agent 2 parts by weight to 4 parts by weight, the catalyst may include 0.01 parts by weight to 1 part by weight, and the foam stabilizer may include 0.01 parts by weight to 1 part by weight.

Meanwhile, the molded article according to the present invention may include the above-described composition for polyurethane foam.

The molded article has an apparent density of 60 kg/m ³ measured by MS257-06. to 70 kg/m ³ , and an ILD 25% hardness measured in an index range of 65 to 115 may be 10 kgf/314 cm ² to 45 kgf/314 cm ² .

The molded article may be an automobile seat pad.

A method for producing a polyurethane foam according to the present invention includes preparing a first component including isocyanate and a first polyether polyol having a hydroxyl value of 400 mgKOH/g to 600 mgKOH/g; preparing a second component comprising a second polyether polyol; Stirring the first component and the second component; And demolding after injecting the mixture obtained in the stirring step into a mold; can include

In conventional soft polyurethane raw materials, among various requirements, one isocyanate and two or more polyether polyols must be used to achieve an ILD 25% hardness in the range of 10 kgf/314cm ² to 45 kgf/314cm ² . However, the same level of hardness can be achieved by using only one isocyanate and one polyether polyol developed through the present invention.

In addition, in conventional raw materials, when the hardness required for automobile seats is 18 kgf/314 cm ² or less or 35 kgf/314 cm ² or more, formability or material properties often fail to meet the requirements of automobile manufacturers, but this Through the invention, such problems can be improved, and the effect of preventing potential defects and recalls can also be expected.

As described above, when using conventional raw materials, it is inevitable to build equipment that can use two or more polyether polyols and one or more isocyanates when constructing a seat foam pad production line for automobiles, but the present invention When raw materials are used, there is no such constraint, reducing potential sunk costs in building new facilities.

In addition, according to the present invention, even if the existing facility is equipment capable of using at least two types of polyether polyol and at least one type of isocyanate, the reduction of raw materials to be used and managed can be expected, thereby reducing the cost of operating the facility. If there are raw material lines, flexibility in line operation can be secured in preparation for sudden evaluation of new raw materials.

The effects of the present invention are not limited to the effects mentioned above. It should be understood that the effects of the present invention include all effects that can be inferred from the following description.

1a is a curing test result for a polyurethane foam pad prepared with the composition of Comparative Example 1 of the present invention.
Figure 1b is a curing test result for a polyurethane foam pad prepared with the composition of Example 1 of the present invention.
2a is a shrinkage test result of a polyurethane foam pad prepared with the composition of Comparative Example 1 of the present invention.
Figure 2b is a shrinkage test result of the polyurethane foam pad prepared with the composition of Example 1 of the present invention.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and the spirit of the present invention will be sufficiently conveyed to those skilled in the art.

Like reference numerals have been used for like elements throughout the description of each figure. In the accompanying drawings, the dimensions of the structures are shown enlarged than actual for clarity of the present invention. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, terms such as "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof. In addition, when a part such as a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where it is "directly on" the other part, but also the case where another part is present in the middle. Conversely, when a part such as a layer, film, region, plate, etc. is said to be "under" another part, this includes not only the case where it is "directly below" the other part, but also the case where another part is in the middle.

Unless otherwise specified, all numbers, values and/or expressions expressing quantities of components, reaction conditions, polymer compositions and formulations used herein refer to the number of factors that such numbers arise, among other things, to obtain such values. Since these are approximations that reflect the various uncertainties of the measurement, they should be understood to be qualified by the term "about" in all cases. Also, when numerical ranges are disclosed herein, such ranges are contiguous and include all values from the minimum value of such range to the maximum value inclusive, unless otherwise indicated. Furthermore, where such ranges refer to integers, all integers from the minimum value to the maximum value inclusive are included unless otherwise indicated.

The polyurethane foam composition according to the present invention may include a first component including an isocyanate and a first polyether polyol and a second component including a second polyether polyol.

Hereinafter, each component of the resin composition will be described in detail.

(A) first component

The first component may include isocyanate and a first polyether polyol.

1) Isocyanate

In the present invention, the isocyanate may include a foam using only methylene diphenyl diisocyanate (MDI) among isocyanates for polyurethane foam.

Specifically, the isocyanate is 4,4- Methylene Diphenyl Diisocyanate (4,4-MDI), 2,4- Methylene Diphenyl Diisocyanate (2,4- Methylene Diphenyl Diisocyanate; 2, 4-MDI), polymethylene diphenyl diisocyanate (P-MDI), modified isocyanate, and combinations thereof.

The isocyanate may have an NCO content of 30 wt % to 32 wt %.

The 4,4-methylenediphenyl diisocyanate (4,4-MDI) is structurally the most similar to toluene diisocyanate (TDI) among the isocyanate components used, and the hardness of the flexible foam in terms of initial rapid reactivity and physical properties can represent

The 4,4-methylenediphenyl diisocyanate (4,4-MDI) may have a weight average molecular weight of 220 g/mol to 280 g/mol.

The 4,4-methylenediphenyl diisocyanate (4,4-MDI) may be included in an amount of 50% to 70% by weight of isocyanate.

If the amount of 4,4-methylenediphenyl diisocyanate (4,4-MDI) is less than 50% by weight, not only shrinkage of the foam may occur, but also the hardness expression range of the foam may be narrowed in the same index range.

The higher the content of 4,4-methylenediphenyl diisocyanate (4,4-MDI), the higher the hardness expression range of the foam in the same index range, but when it exceeds 70% by weight, many open cells are formed and the foam collapses. Otherwise, a defect phenomenon in which the surface of the foam becomes rough may occur.

The 2,4-methylenediphenyldiisocyanate (2,4-MDI) can exhibit excellent elongation or tensile strength, but when the content is high, not only shrinkage of the foam occurs, but also the range of hardness expression of the foam is narrow in the same index range. can lose

The 2,4-methylenediphenyl diisocyanate (2,4-MDI) may be included in an amount of 0.01% to 10% by weight of isocyanate.

The 2,4-methylenediphenyl diisocyanate (2,4-MDI) ranges from 0.01% to 10% by weight because when the content is high, not only shrinkage of the foam occurs, but also the range of hardness expression of the foam is narrowed in the same index range. may be limited to

The polymethylene diphenyl diisocyanate (P-MDI) may have a weight average molecular weight of 350 g/mol to 450 g/mol.

The polymethylene diphenyl diisocyanate (P-MDI) may have 2.5 to 3 functional groups.

The polymethylene diphenyl diisocyanate (P-MDI) has a higher molecular weight and slower reactivity as the number of functional groups increases, and can increase the crosslinking density during urethane reaction.

The polymethylene diphenyl diisocyanate (P-MDI) may be included in an amount of 5% to 25% by weight or 15% to 35% by weight of isocyanate.

If the content of the polymethylenediphenyl diisocyanate (P-MDI) is less than 5% by weight, elasticity may be reduced and riding comfort may be deteriorated.

If the amount of the polymethylene diphenyl diisocyanate (P-MDI) exceeds 25% by weight, the cross-linking density is high, resulting in the formation of many closed cells, which may cause the foam to shrink after the reaction and not maintain the shape of the product.

The modified isocyanate may include methylenediphenyl diisocyanate (MDI) containing at least one selected from the group consisting of uretonimine, carbodiimide, and combinations thereof.

The modified isocyanate may include 0.01 wt % to 5 wt % of isocyanate. In general, modified isocyanate in MDI for automobile seat pad foam is included in the range of 5% to 10% by weight because of its excellent low-temperature stability, but delays the reactivity to lower the curability of the foam and narrows the range of hardness expression, so in the present invention, 5 may be limited to less than or equal to weight percent.

2 ) first polyether polyol

The first polyether polyol may include a polyether polyol obtained by addition polymerization of ethylene oxide (EO) and propylene oxide (PO) using a polymerization initiator.

The polymerization initiator consists of glycerine, triethanol amine, trimethylol propane, pentaerythritol, toluene diamine, ethylene diamine, and combinations thereof It may include at least one or more selected from the group.

The first polyether polyol may have a hydroxyl value of 400 mgKOH/g to 600 mgKOH/g.

The first component may include 0.01 wt % to 5 wt % of the first polyether polyol.

If the amount of the first polyether polyol exceeds 5% by weight, problems such as elasticity and riding comfort of the sheet may occur, so that the content is limited to 5% by weight or less.

(B) second component

The second component may include a second polyether polyol.

The second component may further include at least one selected from the group consisting of a crosslinking agent, a foaming agent, a catalyst, and a foam stabilizer.

The second component may include additives commonly used in the field of manufacturing polyurethane foam.

1) Second polyether polyol

The second polyether polyol may include polyether polyol a, polyether polyol b, and polyether polyol c.

The second polyether polyol includes 60 parts by weight to 100 parts by weight of the polyether polyol a, 0.01 part by weight to 40 parts by weight of the polyether polyol b, and the polyether polyol c based on 100 parts by weight of the first component. may include 0.01 part by weight to 1 part by weight.

The polyether polyol a may have an average number of hydroxyl groups of 1 to 5.

The polyether polyol a may have a hydroxyl value of 10 mgKOH/g to 40 mgKOH/g.

The polyether polyol a may have an ethylene oxide (EO) content of 0.01 wt % to 20 wt %.

The polyether polyol a may include a trifunctional polyether polyol.

The polyether polyol b may have a solid content of 30% to 60%.

The polyether polyol b may have a hydroxyl value of 10 mgKOH/g to 50 mgKOH/g.

The polyether polyol c may have 2 to 6 average hydroxyl groups.

The polyether polyol c may have a hydroxyl value of 10 mgKOH/g to 60 mgKOH/g.

The polyether polyol c may have an ethylene oxide (EO) content of 50% by weight or more.

The polyether polyol c may preferably have a structure in which ethylene oxide and propylene oxide are randomly added and polymerized.

The polyether polyol c may preferably have a structure in which ethylene oxide is added as a terminal or a block.

The crosslinking agent may have 2 to 3 hydroxyl groups.

The crosslinking agent may have a hydroxyl value of 200 mgKOH/g to 2000 mgKOH/g.

The crosslinking agent is ethylene glycol, 1,4-butanediol, diethylene glycol, triethylene glycol, dipropylene glycol, monoethanolamine (Monoethanolamine), diethanolamine (Diethanolamine), triethanolamine (Triethanolamine), glycerin (Glycerin), and at least one selected from the group consisting of combinations thereof.

The blowing agent includes water.

The catalyst is a component for accelerating the reaction between isocyanate and polyether polyol.

The catalyst is triethylenediamine, triethylamine, diethanolamine, triethanolamine, N-methylmorpholine, N-ethylmorpholine ( It may include at least one selected from the group consisting of amine catalysts such as N-ethyl morpholine) and organotin catalysts such as stannous octoate and dibutyltin dilaurae (DBTDL). .

The anti-foaming agent is a component for adjusting the formation of cells having a uniform shape and size and preventing the cells generated from being united or destroyed when cells are formed inside the polyurethane foam.

The foam control agent is commonly used in the field and is not particularly limited, but a silicone-based foam control agent may be generally included.

The silicone-based foam stabilizer may include at least one selected from the group consisting of polysiloxane and derivatives thereof.

The silicone-based foam stabilizer may be specifically a polyalkylene oxide methylsiloxane copolymer.

In another aspect, the present invention relates to a molded article comprising the above-described composition for polyurethane foam.

The molded article is not limited in its application field, but may be applied to an automobile seat pad.

The molded article has an apparent density of 60 kg/m ³ measured by MS257-06. to 70 kg/m ³ .

The molded article may have an ILD 25% hardness measured in an index range of 65 to 115 of 10 kgf/314cm ² to 45 kgf/314cm ² .

The molded article may have a permanent compression ratio of 25% or less after 50% compression at 70° C. to 90° C. for 20 hours to 24 hours.

The index is an index representing the input amount of isocyanate and polyether polyol when isocyanate is reacted with polyether polyol to produce polyurethane. When isocyanate is added in the same amount as stoichiometry, this index is 100 and the stoichiometry We say that this index is greater than 100 when there is an excess of the theoretical input.

The molded article may include molded articles having an index of 70 to 120.

The ratio is not particularly limited, but may be 33 parts by weight to 58 parts by weight of the first component based on 100 parts by weight of the second component.

The preparation method of the polyurethane inclusive composition includes preparing a first component including isocyanate and a first polyether polyol having a hydroxyl value of 400 mgKOH/g to 600 mgKOH/g; preparing a second component comprising a second polyether polyol; Stirring the first component and the second component; And demolding after injecting the mixture obtained in the stirring step into a mold; can include

The stirring of the first component and the second component may be performed at 4000 rpm to 6000 rpm for 5 seconds to 10 seconds.

In the step of demolding after injecting the mixture obtained in the stirring step into a mold, demolding may be performed after 250 seconds to 300 seconds after injecting the mixture into a mold having a temperature of 50 ° C to 70 ° C.

Hereinafter, the present invention will be described in detail with reference to the following Examples and Comparative Examples. However, the technical spirit of the present invention is not limited or limited thereby.

Example 1 and Comparative Examples 1 to 3

Polyurethane foam compositions were prepared with the compositions shown in Tables 1 and 2 below.

Specifically, it was prepared by mixing the first component and the second component according to the components and contents shown in Tables 1 and 2 below, respectively. After stirring the first component and the second component thus prepared at about 5000 rpm for about 7 seconds, the temperature was raised to 50 ℃ to 70 ℃ 400 * 400 * 100mm _--- ³ After injection into the aluminum mold, the mold was closed and demoulded after 270 seconds to prepare a polyurethane foam pad.

[Table 1]

[Table 2]

Experimental example

After storing the pads prepared in Example 1 and Comparative Examples 1 to 3 for 1 day in a place where constant temperature and humidity were maintained, physical properties were measured according to MS200-34, which is a physical property standard for urethane foam. The results are shown in Table 3, Table 4, Table 5 and Table 6.

[Assessment Methods]

(1) Index: It is an index indicating the input amount of isocyanate and polyether polyol when producing polyurethane by reacting isocyanate with polyether polyol.

(2) Apparent density: It was produced at a level of 57 kg/m ³ to 63 kg/m ³ based on the core density measured by samples cut from the pad, and the physical properties were evaluated under conditions that met the weight and basic performance requirements of the sheet component unit. did

(3) Hardness: After fixing a specimen of 400*400 mm in thickness and 100 mm in UTM (universal testing machine) to a fixing jig (KSM 6549 (FORM RUBBER)), apply a load to the pressure plate at a speed of 100 mm/min, and Measure the pressure (kPa) value after 30 seconds in the state of compression up to 25%.

(4) Permanent shrinkage: 50*50 mm, thickness 20 mm to 50 mm The thickness is measured at the center of the test piece, 75% of the thickness is compressed and fixed with a parallel compression plate, maintained at the measured temperature for 22 hours, and then at room temperature for 30 minutes After standing, the thickness was measured.

(5) Curability: Using a 400*400*20 mm ³ square mold equipment, the first component and the second component are stirred at indexes of 100, 110, and 120, and then put into the mold. The input amount is calculated and input according to the density of 60 kg/m ³ . After putting it into the square mold equipment, the foam is demolded after 270 seconds. When removing the mold, hold the foam with one hand at one corner and remove the mold, checking the handprints that occur at this time. In addition, press the middle of the foam with your finger every 10 seconds to check until the time when the pressed handprint does not occur.

The case of handprints after demolding is X, the case of handprints occurring within 1 minute after demolding is △, and the case of no handprints after demolding is indicated as O.

(6) Shrinkage: Using a 400*400*100 mm ³ square mold equipment, the first component and the second component are stirred at indexes of 70, 80, 90, and 100, and put into the mold. The input amount is calculated and input according to the density of 70 kg/m ³ . After 270 seconds have elapsed after putting it into the square mold equipment, the foam is demolded, and after 1 minute, it is checked whether the surface and the entire foam have undergone deformation due to shrinkage.

The case of severe shrinkage after demolding is X, the case of fine shrinkage on the surface after demolding is △, and the case of no shrinkage and foam deformation after demolding is indicated as O.

[Table 3]

[Table 4]

[Table 5]

[Table 6]

Looking at the physical property results in Tables 3 to 6, it can be seen that Comparative Example 1 is a conventional composition for preparing a vehicle seat pad, and shrinkage occurs as the index is lower, and curability is greatly reduced as the index is higher. 1a is a curing test result for a polyurethane foam pad prepared with the composition of Comparative Example 1 of the present invention. Generally, the higher the foaming index, the lower the curability of the foam. It can be seen from FIG. 1a that in Comparative Example 1, even at an index of 100, handprints occurred due to lack of hardening. Therefore, it can be confirmed that the index range in which the polyurethane foam according to Comparative Example 1 can be perfectly molded is 90 to 100. In addition, since the rate of increase in hardness according to the increase in index is low, when it is necessary to manufacture a foam with high hardness, such as a side bolster of an automobile seat, it is inevitable to mix and use raw materials with high hardness. 2a is a shrinkage test result of a polyurethane foam pad prepared with the composition of Comparative Example 1 of the present invention. In general, the lower the foaming index, the more shrinkage deformation of the foam occurs. 2a, it can be seen that in Comparative Example 1, shrinkage occurred on the surface even at index 80. In particular, when a foam with low hardness is produced, the deformation of the foam may become more severe because a foam having an index of 80 or less must also be produced.

Comparative Example 2 and Comparative Example 3 improved the hardness increase rate according to the index by increasing the 4,4-MDI content, but it can be seen that the difference in effect is not relatively large in improving the curability and shrinkage.

Meanwhile, in the case of Example 1, compared to Comparative Examples 1 to 3, the content of 4,4-MDI was increased and the contents of 2,4-MDI, P-MDI and modified isocyanate were lowered, and the types of polyether polyol for polymerization By changing , it was possible to maximize the hardness increase rate according to the index change. Figure 1b is a curing test result for a polyurethane foam pad prepared with the composition of Example 1 of the present invention. Generally, the higher the foaming index, the lower the curability of the foam. It can be seen from FIG. 1b that in Example 1, even at an index of 120, no fingerprints were generated due to lack of hardening, and the moldability was excellent. Figure 2b is a shrinkage test result of the polyurethane foam pad prepared with the composition of Example 1 of the present invention. In general, the lower the foaming index, the more shrinkage deformation of the foam occurs. 2b, it can be seen that in Example 1 of the present invention, no deformation of the foam due to shrinkage occurred even at an index of 70.

Therefore, in Example 1, no foam deformation occurred at a low index, and no fingerprints due to lack of curing occurred at a high index, indicating that the moldable index range of the vehicle seat was about 70 to 120. In addition, other physical properties, such as permanent shrinkage, are not significantly reduced, so it can be confirmed that the composition is suitable for a vehicle seat pad composition.

As described above, although the embodiments have been described with limited examples and drawings, those skilled in the art can make various modifications and variations from the above description. For example, even if the described techniques are performed in a different order from the described method, and/or the described components are combined or combined in a different form than the described method, or substituted or replaced by other components or equivalents. Appropriate results can be achieved. Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

Claims (17)

a first component comprising an isocyanate and a first polyether polyol having a hydroxyl value of 400 mgKOH/g to 600 mgKOH/g; and
A composition for polyurethane foam comprising a second component including a second polyether polyol. According to claim 1,
The isocyanate is 4,4- Methylene Diphenyl Diisocyanate (4,4-MDI), 2,4- Methylene Diphenyl Diisocyanate (2,4- Methylene Diphenyl Diisocyanate; 2,4- MDI), polyethylene diphenyl diisocyanate (Poly methylene diphenyl diisocyanate; P-MDI), modified isocyanate, and a composition for polyurethane foam comprising at least one selected from the group consisting of combinations thereof. According to claim 1,
The isocyanate is
4,4-methylene diphenyl diisocyanate (4,4- Methylene Diphenyl Diisocyanate; 4,4-MDI) is 50% to 70% by weight;
2,4-Methylene Diphenyl Diisocyanate (2,4-MDI) is 0.01% to 10% by weight;
Poly Methylene Diphenyl Diisocyanate (P-MDI) is 5% to 25% by weight; and
Modified isocyanate is 0.01% by weight to 5% by weight; Polyurethane foam composition comprising a. According to claim 1,
The isocyanate is a polyurethane foam composition having an NCO content of 30% to 32% by weight. According to claim 1,
The first component is a composition for polyurethane foam comprising 0.01% by weight to 5% by weight of the first polyether polyol. According to claim 1,
The second polyether polyol is
polyether polyol a having an average number of hydroxyl groups of 1 to 5, a hydroxyl value of 10 mgKOH/g to 40 mgKOH/g, and an ethylene oxide (EO) content of 0.01% to 20% by weight;
polyether polyol b having a solid content of 30% to 60% and a hydroxyl value of 10 mgKOH/g to 50 mgKOH/; and
Polyether polyol c having an average number of hydroxyl groups of 2 to 6, a hydroxyl value of 10 mgKOH / g to 60 mgKOH / g, and an ethylene oxide (EO) content of 50% by weight or more;
The second polyether polyol is based on 100 parts by weight of the first component
The polyether polyol a is 60 parts by weight to 100 parts by weight,
The polyether polyol b is 0.01 part by weight to 40 parts by weight and
The polyether polyol c is a polyurethane foam composition comprising 0.01 part by weight to 1 part by weight. According to claim 1,
The second component further includes at least one selected from the group consisting of a crosslinking agent, a foaming agent, a catalyst, and a foam stabilizer,
Based on 100 parts by weight of the first component
The crosslinking agent is 1 part by weight to 3 parts by weight,
2 parts by weight to 4 parts by weight of the foaming agent,
The catalyst is 0.01 part by weight to 1 part by weight,
The foam stabilizer composition for polyurethane foam comprising 0.01 part by weight to 1 part by weight. A molded article comprising the composition for polyurethane foam according to any one of claims 1 to 7. According to claim 8,
Apparent density measured by MS257-06 is 60 kg/m ³ to 70 kg/m ³ , and the ILD 25% Hardness measured in the index range of 65 to 115 is 10 kgf/314cm ² to 45 kgf/314cm ² . According to claim 8,
The molded article is a molded article of a car seat pad. preparing a first component including an isocyanate and a first polyether polyol having a hydroxyl value of 400 mgKOH/g to 600 mgKOH/g;
preparing a second component comprising a second polyether polyol;
Stirring the first component and the second component; and
demolding after injecting the mixture obtained in the stirring step into a mold;
Method for producing a polyurethane foam comprising a. According to claim 11,
The isocyanate is 4,4- Methylene Diphenyl Diisocyanate (4,4-MDI), 2,4- Methylene Diphenyl Diisocyanate (2,4- Methylene Diphenyl Diisocyanate; 2,4- MDI), Poly Methylene Diphenyl Diisocyanate (P-MDI), modified isocyanate, and a method for producing a polyurethane foam comprising at least one selected from the group consisting of combinations thereof. According to claim 11,
The isocyanate is
4,4-methylene diphenyl diisocyanate (4,4- Methylene Diphenyl Diisocyanate; 4,4-MDI) is 50% to 70% by weight;
2,4-Methylene Diphenyl Diisocyanate (2,4-MDI) is 0.01% to 10% by weight;
Poly Methylene Diphenyl Diisocyanate (P-MDI) is 5% to 25% by weight; and
Modified isocyanate is 0.01% by weight to 5% by weight; Method for producing a polyurethane foam containing. According to claim 11,
The isocyanate is a method for producing a polyurethane foam having an NCO content of 30% to 32% by weight. According to claim 11,
The first component is a method for producing a polyurethane foam comprising 0.01% to 5% by weight of the first polyether polyol. According to claim 11,
The second polyether polyol is
Polyether polyol a having an average number of hydroxyl groups of 1 to 5, a hydroxyl value of 10 mgKOH/g to 40 mgKOH/g, and an ethylene oxide (EO) content of 0.01% to 20% by weight;
polyether polyol b having a solid content of 30% to 60% and a hydroxyl value of 10 mgKOH/g to 50 mgKOH/; and
Polyether polyol c having an average number of hydroxyl groups of 2 to 6, a hydroxyl value of 10 mgKOH / g to 60 mgKOH / g, and an ethylene oxide (EO) content of 50% by weight or more;
The second polyether polyol is based on 100 parts by weight of the first component
The polyether polyol a is 60 parts by weight to 100 parts by weight,
The polyether polyol b is 0.01 part by weight to 40 parts by weight and
The method of producing a polyurethane foam comprising 0.01 part by weight to 1 part by weight of the polyether polyol c. According to claim 11,
The second component further includes at least one selected from the group consisting of a crosslinking agent, a foaming agent, a catalyst, and a foam stabilizer,
1 to 3 parts by weight of the crosslinking agent based on 100 parts by weight of the first component,
2 to 4 parts by weight of the foaming agent,
The catalyst is 0.01 to 1 part by weight and
The method for producing a polyurethane foam containing 0.01 to 1 part by weight of the foam stabilizer.

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